So, if i dont have 50-60 explosives i cant finish this quest? Is there workaround rather than increasing explosive skills?

I did this one last night. You don't have to blow it up (I didn't) but it seems like it would be more satisfying that way. You can just kill all the geckos and go back to the quest giver who will send you to Red Rock to get permission for him and his escaped convict boys to join the Great Khans. Then the quest ends.

Comprehension perk and skillbooks..

Or skillbook and mentats...

How far are you from 50 explosives ?

aha, and those khas will join sceaser and gang up on ncr, no way, i'm with ncr id rather go kill small pests now ))

ps i have 26 expl at the moment

To hell with that quest and those escaped pricks they're already dead now +carma and stuff good for me, end of story

In some of the postmortem endings, if you do not take care of the convicts in Vault 19, it says they harassed people in the wasteland for years to come.

In addition to explosives skill you need 4 or 5 packs of C4. I had to come back later and finish the job when I had all the requirements.